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High Idle

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Old Oct 10, 2020 | 08:05 PM
  #1  
Jim L.'s Avatar
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High Idle

Hello all
My 89 F-150 had been experiencing a high idle. 1100-1300 rpm. I replaced the stock throttle body with a new BBK unit. It still has the same idle characteristics. The truck is a two wheel drive with the 5.0 and 5 speed manual transmission. Any help would be greatly appreciated. Thanks Jim
 
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Old Oct 10, 2020 | 08:08 PM
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High idle

The gasket below the plenum is known to be the source of what you are describing.
 
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Old Oct 10, 2020 | 08:58 PM
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Before you replaced the throttle body did you unplug the IAC? If so, did the truck barely idle or stall? If not you have a vacuum leak which you still have.
 
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Old Oct 11, 2020 | 05:20 AM
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did you follow the instructions after installing
BBK-3503.pdf
 
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Old Oct 11, 2020 | 06:25 AM
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Originally Posted by torq'ta 5 8
did you follow the instructions after installing
BBK-3503.pdf
Forgot that you need to adjust the throttle stop screw on the BBK to set idle speed and TPS voltage when first installed.
 
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